First responders on the scene of Dayton’s mass shooting — those who took down a gunman and others who treated the wounded — may find it hard to heal emotionally from the experience, said clinical psychologist Dr. Kathy Platoni.

“Even for the most seasoned officers, you are going to see some psychological reactions,” Platoni said. “This certainly has a far-reaching impact on anybody who was there and who had to witness this kind of carnage.”

Nine were killed and another 27 injured when the shooter opened fire at 1:07 a.m. in the Oregon District. Dayton officers killed the shooter.

Platoni, who has a Centerville practice, is part of a stress management team that met Sunday with officers who responded to Oregon District early Sunday. An Army reservist, she is also a survivor of a November 2009 mass shooting at Fort Hood where 13 died and another 30 were injured.

Five members of the Southwest Ohio Critical Incident Stress Management Team met with about 25 Dayton police officers in “diffusing sessions” at two locations by 10 a.m. Sunday, Platoni said. The group of about 40 volunteers includes mental health professionals like Platoni, as well as police officers, firefighters, medics and chaplains.